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If your running stock than i def. would say its worth the money. It makes your bike a heck of a lot quiter! White Brothers claims the E2 can give a gain of 2-4 horsepower depending on the bike. 360.00 is a little high. Give TREMX a call i gurantee they will sell you one cheaper. Probably around 340-345 including shipping. Tell them Shane sent you. 1 888 873 6926 is the toll free number.

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I'm running the Pro Circuit T-4 full system on my 01' 426 and it made one hell of a difference in the low to mid range. Its a little pricey but I would say its well worth the money. Its also a lot louder than the stock pipe but I think pro circuit sells a quiet tip for it.

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I would just buy a powerbomb header and leave the stock silencer. They claim I think 3hp. Most pipes take from one area and give to another but this pipe delivers more everywhere at least what I see from the dynos. I read somewhere that yamaha is making a powerbomb type header for the 08 model.

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I've been thinking about buying one but unsure if there will be a great power gain.

If you are talking just the silencer, $360 sounds a little high on price. I payed $249 for mine. Power gain - Worth every penny. Only complaint - It is loud. Mine came with plates and a Forest approved Spark arrestor but it is still loud- Even with the plates.